Used only for Single Pc(Mean Water Tank and Commode Fixed together) Bathroom Commode Cistern Fitting MORE WATER-SAVING: With its soft and hard flush design, water consumption options 3 and 6 liter it saves more water and the custom-designed set eliminates common leaky toilet problems due to worn out flapper, toilet handle, etc. INNOVATIVE DESIGN: Its 2-button dual flush design and Flush as well as Adjustable Fill Valve fits to any cistern. Installs without any tools in 5 to 10 minutes - tank removal not required. Dual Flush Valve Siphon